Believe it or not some HVAC companies charge a one hour service fee upwards of a 100 dollars to replace your batteries! One of the largest contributors to no heat calls is dead thermostat batteries. More often than not homeowners call HVAC companies with no heat calls and a technician is sent out only to find that the thermostats batteries are dead. Thankfully your a LeBlanc Heating customer and you have resources to teach you how to change those batteries for FREE!